Multiple Choice
Atmospheric chemists think that Earth's first atmosphere
A) contained large amounts of molecular oxygen.
B) consisted of carbon in the form of carbon monoxide.
C) contained nitrogen in the form of ammonia and nitrogen gas.
D) contained no oxygen atoms.
E) was very similar to today's atmosphere.
Correct Answer:

Verified
Correct Answer:
Verified
Q15: Which of the following is not associated
Q16: The oldest fossils look as though they
Q17: What term is used to indicate a
Q18: During which geological era did Pangea break
Q19: Eukaryotic cells are thought to have<br>A)appeared about
Q21: It is thought by scientists that the
Q22: Paleontologists have found fossils dating back 3.6
Q23: How do we know that the atmosphere
Q24: When taxonomists classify organisms using a phylogenetic
Q25: Explain how the presence of Pangea relates